• Who was Copernicus?
  In the 1500s, most people thought the Earth was fixed in the center ...

• What’s so special about the Earth?
  The Earth is the only planet with temperatures at which water can ...

• Who were the first men on the moon?
  The first men on the Moon were Neil Armstrong and Buzz Aldrin of the ...

• What are the Moon’s seas?
  The large dark patches visible on the Moon's surface are called seas, ...

• How long is a month?
  It takes the Moon 27.3 days to circle the Earth, but 29.53 days from ...

• What makes you grow?
  A growth hormone tells your body to grow. This is produced in the ...

• What is the menopause?
  The menopause is when a woman's body changes so that she is no longer ...

• Who had the most children?
  It is believed that a Russian woman who lived in the 1700s holds this ...

• What are hormones?
  Hormones are chemicals released into the blood from various glands. ...

• Why do people age?
  The cells of the body are constantly being renewed, except for brain ...